Over a year ago I purchased 2 male ducks when they were both about 3 days old. They came from two different flocks but bonded immediately. These are the only 2 ducks I have as they were pets and I have no other outdoor animals. Last night when I got home from school, I noticed that the top of their cage was not fully secured and I saw one of my ducks lying dead with its throat slashed while my other duck was hiding in the back. I'm not sure what got into the cage or if it was my other duck who had killed him. They were pretty much inseparable, but the surviving duck was the one who kind of picked on my now dead duck. Is there any possibility my duck may have killed the other? My other duck is eating and drinking but he won't leave his pen. I don't know what to do with him as I do know ducks are social animals. He is obviously very depressed and is kind of walking in circles. He wouldn't leave the pen even when I gave him treats and will not even come by me. Whatever advise you have would be greatly appreciate.